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40W output from serial port during 3530 boot

John F.
Intellectual 830 points
Other Parts Discussed in Thread: OMAP3530

Where does the "40W" text output on the serial console during boot come from?  x-loader or from the CPU?

 

Thanks,

John

  • 0
    TI__Guru 64500 points

    John F. said:

    Where does the "40W" text output on the serial console during boot come from?  x-loader or from the CPU?

     

    The ROM code of the OMAP3530 will send this out if the device is configured to support a Peripheral boot mode.

    I had thought it was 40T, though.

  • 0 in reply to BrandonAzbell
    Intellectual 830 points

    In my case (booting from SD versus UART3), I get an ASIC ID which includes "40W".  Is there any way to tell from this output how far I got in the boot process or what errors may have occurred?  Is there a more detailed description besides figure 1-10 in the TRM?

     

    By the way, the bytes sent out the UART are:

    04 01 01 34 30 07 57 13  02 01 12 55 10 40 80 01 04

  • 0 in reply to John F.
    TI__Guru 64500 points

    What is the sys_boot[6:0] configuration?

    I haven't really interrogated the serial data coming out of the OMAP3530 as you captured above.  Just knew that 40T, or in your case 40W, was sent out when I connected the serial port to a terminal program.

  • 0 in reply to BrandonAzbell
    TI__Genius 15510 points

    The bytes are the ASIC ID. I can't remember where it is documented, but the 34 30 07 57 hex would print out as character '40<ascii bell>W'.  That hex 57 some how eqates to ROM code version or chip ES.  Look around the initialization chapter of the TRM.  I don't have it handy, but it might describe the ASIC ID.

    Steve K.